Dividing factorials on 15C CE

[philiph]

Hello,
I have a question concerning my new 15C Collector's Edition.
When I tried to calculate combinations this morning, I discovered that if I type
50! divided by 45! I get the result:
254,251,199.9 instead of 254,251,200
When I type
49! divided by 45! I get the result
5,085,023.998 instead of 5,085,024
When I type
35! divided by 30! I get the result:
38,955,840.02 instead of 38,955,840
and so on.
Does anyone know the reason for this bug?
Thanks for your help!
Phil